Preformed rail filler



May 22, 192s. l i 1,671,022-

` Ag. FISCHER Pnsroxm RAIL FI'LLBR filed June so, 1927 Mbr Owe/zg??? Patented May 22, 19,28.

'UNITED ls'ra'rrs 1,671,022 PATENT OFFICE.

maar c. naomi-n, or cmcaeo, rumors.

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Application nea inne-so, 1921. sei-m n. 202,580.

My invention relates to a 4preformed rail filler comprising a prepared strip of waterproofing material, preferably vbituminous material, or othersuitable binder shaped to conform to the outline of the rail'on one side and suitably faced for contact with the paving on the other side, the strip being' adapted to act as an insulating, sound deadening and expansion material, deadening thesound of the car upon the rail and insulating the track from the adjacent paving material, and taking up expansion and contraction between them.

My invention is concerned more with the' A substance out of which the strips are made rather than to their particular form.

One of the objects of my invention resides in providing a preformed rail filler comprising waterproofing binder and granulatedcork, suitably intermixed, not only to assist in the insulating and sound deadening characteristics of the strip, and providing an efficient llowretarder for the compressible waterproofing binder, such as bituminous material, but also providing expansibility and compressibility of the strip. f

These and other objects of my invention will be apparent from a perusal of the following speciication when taken in connection with the accompanying drawings, wherein,

Figures 1 to 6 inclusive illustrate various designs of strips which maybe used singly or collectively in connection with thevrail filler, after the manner illustrated and claimed in an application filed by H. W. Herbst on January 6, 1926, Serial No. 79,543.

It is understood that any of the blocks or strips shown in my jointapplication aforesaid, or any other type of strip may be 4availed of, the present invention be' concerned with the material of which the railller strips are composed.'

The present application contains subject matter withdrawn from the application Serial No. 79,543, the former case being.

limited to the shape and construction of the rail filler, and the present case being limited gi] the materials used vin making the rail er. Y In my present invention I propose to form my rail filler of a mixture of water material and a. cellular, granular liler, the same preferably being granulated cork, al-

.though the invention is not restricted thereto, but broadly comprehends material of any granular form.

As an alternative construction I may, however, if desired, add to the cork finely divided fibrous material, or I may add linear libres, the latter of which gives strengthening characteristics to -the rail filler, while the former merely acts as a 'flow retarder and lends compressibility to the strip.

The waterproofing binder may consist of a. suitable blown asphalt or any other suitable bituminous material having binding and waterproofing qualities.

The waterproof binder as a modified form may consist of bituminous material having added thereto dissolved rubber, or resin.

' The proportion of anulated cork may run as high as twenty-fgnre per; cent, or more, but preferably twenty-five percent mixed with approximately seventy-five per cent of the bituminous material.

Y The binder may be suitably mixed withv the granulated cork and/or the linear fibres in a suitable power mixer, and extruded, rolled, molded or pressedinto form.

In certain instances I may also add to any of the substances above noted, or any bitluninous material -will insulate the granite. concrete or Abrickpaving about Vthe rail, and the compressible and cellular structure of the granules will take up the sound and revent its transmission from the rail to the ard paving substance. Y

The binder with the aid of the filler will also provide a suitable e ansion joint material, Vdue to the compressi le qualities of the bituminous or like material, and the resili! ency of the cork granules and/or the linear libres. These elements serve lto take up vibration.

I Y v 1. A pi-eformed rail filler adapted for use as gn insulator, sound deadener and expansion joint, comprisingv a homogeneous mixilo ' ture of waterproof binder, granulated cork,

` i/ture of.r waterproof binder and granulated cork.o l

2. A preformed rail filler adapted for uso as aninsulator, sound deadener and expan- 5 sion joint, comprising a homogeneous mixture of waterproof material, granulated Cork and linear fibres.

' 3. 'A preformed rail filler adapted for use as an insulator, sound deadener and expansion joint, comprising a homogeneous mix- I finely divided fibres and an'earthy material.

4. A preformed rail filler adapted for use las an insulator, sound deadener and expanw-A sion joint, comprising a homogeneous mixture of waterproof material,` compressible granular material, and linear fibers. 7

Signed at Chicago, Illinois, this f16th day ofJune 1927.

ALBERT C.l FISCHER. 

